<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>05-01</title>
  <style>
    .test { background-color: 'yellow';  border: double 4px gray; }
    .over { background-color: 'aqua'; width:300px; height:100px;  }
  </style>
</head>
<body>
    <div style="background-color: orange;"
        class="test over" ></div>
</script>
</body>
</html>
